SILC (Secure Internet Live Conferencing) is a protocol which provides secure conferencing and chat services. It can be used to send any kind of messages, in addition to normal text messages, including multimedia messages like images, video, and audio stream. All messages in the SILC network are encrypted and authenticated, and messages can also be digitally signed. SILC protocol supports AES, SHA-1, SHA-2, PKCS#1, PKCS#3, X.509, OpenPGP, and is being developed in the IETF. The software is delivered as SILC Client for end users, SILC Server for system administrators, and SILC Toolkit for application developers.

Tor is a network of virtual tunnels that allows people and
groups to improve their privacy and security on the Internet.
It also enables software developers to create new
communication tools with built-in privacy features. It
provides the foundation for a range of applications that allow
organizations and individuals to share information over
public networks without compromising their privacy.
Individuals can use it to keep remote Websites from tracking
them and their family members. They can also use it to
connect to resources such as news sites or instant
messaging services that are blocked by their local Internet
service providers (ISPs).

lighttpd is a secure, fast, compliant, and very flexible Web server
which has been optimized for high-performance environments. It has a
very low memory footprint compared to other Web servers, and it takes
care of CPU load. It has an advanced feature set that includes FastCGI
(load balanced), CGI, Auth, Output-Compression, URL-Rewriting, SSL, and
much more.

Sudo (su "do") allows a system administrator to give certain users (or groups of users) the ability to run some (or all) commands as root while logging all commands and arguments. Sudo operates on a per-command basis, it is not a replacement for the shell.

TXR is a new data munging language. TXR's special pattern language provides template-based matching of entire documents or large sections of documents. It also contains a language for functional and imperative programming. It is written in C and takes the form of a utility that is portable to Unix-like platforms and Windows.